Asingle conservative force fx = (6.0x − 12) n (x is in m) acts on a particle moving along the x axis. the potential energy associated with this force is assigned a value of +20 j at x = 0. what is the potential energy at x = 3.0 m?

Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.

Explain why electric current cannot exist if a current doesn't have a voltage source.

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost